Key points:- Only about 100 individuals of the Gilbert's potoroo species are left- Six have been released back at Two Peoples Bay National Park, after a bushfire in 2015- Tracking devices will help researchers keep tabs on the potoroos in a bid to secure their futureIt is estimated about 100 Gilbert's potoroos remain, with the species originally thought to be extinct in the 1900s.The wild population was wiped out by a bushfire that tore through 90 per cent of the habitat in 2015 prompting a major effort to save the species from extinction.Six potoroos were recently released back into the area at Two Peoples Bay on the slopes of Mount Gardner by the Department of Biodiversity, Conservation and Attractions."It's important as we hope to learn if the potoroos can use the area that was burnt in 2015 … the vegetation is not as thick."Principal research scientist Lesley Gibson said the insurance populations, away from predators, were key to the species' survival."